ECG Monitoring Flashcards
1
Q
What is the difference between unipolar and bipolar leads?
A
Uni polar are measured from a common potential (average potential of the body)
Bipolar are measured between electrodes
2
Q
How many bipolar leads are there?
A
3
3
Q
How many unipolar leads are there?
A
3
4
Q
What are the sizes of the boxes on ECG paper?
A
Big box = 5mm, 0.5mV
5
Q
What is the speed of ECG paper?
A
25mm/s
6
Q
What are the 4 methods of galvanic isolation?
A
Inductive (transformer)
Optoisolation (LED + photodiode, most common)
Magnetic (coil + Hall effect sensor)
Capacitive (capacitor, distorts signal)
7
Q
What are three ways to protect an ECG machine from a defibrilator shock?
A
Neon glow lamp
Gas discharge arrestor
Transient voltage suppressor
